The activist group WikiLeaks announced Thursday that it is offering up to a $50,000 reward for video footage of a controversial American airstrike in Afghanistan, Time magazine reported.

The attack, which targeted a hospital Saturday in Kunduz, killed 22 people. Army Gen. John F. Campbell, the top U.S. commander in Afghanistan, described the airstrike as a mistake.

“Our patients burned in their beds. Doctors, nurses, and other staff were killed as they worked. Our colleagues had to operate on each other,” Jason Cone, the executive director of Doctors Without Borders aid group, said during a New York press conference Wednesday.

A post on WikiLeaks’ website says the AC-130 plane used in the airstrike records its attacks with high resolution gun cameras and that the footage should have been retained along with cockpit audio.

“We are raising a US$50,000 bounty to obtain the footage, the cockpit audio, the inquiry report and other relevant materials such as the Rules of Engagement active at the time,” the post says.

The website is currently well short of its fundraising goal.